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In the spirit of keeping my app DRY, i would like to store an array of
strings, and call this array in a few views and possibly in my
controller.
Where is the best place to declare an application wide static variable?
And is this possible?
array = ['why should', 'I have to copy this', 'every time i want to use
it']

Well, if it's not going to change, you make it a constant.
Constants in ruby are in uppercase.
MY_ARRAY = ['why should', 'I have to copy this', 'every time i want
to use > it']
Normally this should be enough, but if you want to go extra safe you
can freeze it, since an array is an object (http://www.ruby-doc.org/
core/classes/Object.html#M000354).
where to put it in Rails: one option is to declare it in a file in the
lib directory. Rails loads what is in lib.
To make sure it will never conflict with any other, you could put it
into a module, and call it as
ModuleName::MY_ARRAY
Elise